How to solve 'cannot convert ‘int’ to ‘cv::DescriptorExtractor’ in initialization'?

bigg_detector

asked 2012-10-07 16:51:13 -0600

sam
2570 ●233 ●269 ●290

  sam@sam:~/code/ros/recognition/bigg_detector$ rosmake
  [ rosmake ] rosmake starting...                                                                                                                
  [ rosmake ] No package specified.  Building ['bigg_detector']                                                                                  
  [ rosmake ] Packages requested are: ['bigg_detector']                                                                                          
  [ rosmake ] Logging to directory /home/sam/.ros/rosmake/rosmake_output-20121008-104935                                                         
  [ rosmake ] Expanded args ['bigg_detector'] to:
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  [ rosmake ] Last 40 linesgg_detector: 3.1 sec ]                                                                     [ 1 Active 33/34 Complete ]
  {-------------------------------------------------------------------------------
    Finding dependencies for /home/sam/code/ros/recognition/bigg_detector/cfg/BiGG.cfg
    -- Configuring done
    -- Generating done
    CMake Warning:
      Manually-specified variables were not used by the project:

        CMAKE_TOOLCHAIN_FILE


    -- Build files have been written to: /home/sam/code/ros/recognition/bigg_detector/build
    cd build && make -l4
    make[1]: Entering directory `/home/sam/code/ros/recognition/bigg_detector/build'
    make[2]: Entering directory `/home/sam/code/ros/recognition ...

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answered 2012-10-07 23:18:35 -0600

roehling
1951 ●25 ●28 ●43 http://www.fkie.fraunhofer.de/

updated 2012-10-29 00:01:01 -0600

The error message "expected type-specifier" on the preceding line indicates that you have misspelled a type name or forgot to #include the appropriate header file where the type is defined. From this point on, the parser is thrown off the track, which means the error message about the int conversion is bogus and will disappear once you fix the original error. (It's probably some ancient C rule about converting unknown types to int by default.)

Update: The offending line according to the posted sources (see comment below) is

static cv::DescriptorExtractor* descriptorExtractor = new cv::SiftDescriptorExtractor;

and the error message (line 89, column 61) points to the cv::SiftDescriptorExtractor part. On my system, this class is defined in the header <opencv2/nonfree/features2d.hpp>, which (as far as I can tell) is not included anywhere.

NB. This is not rocket science. All the information you needed was there, and I even pointed you in the right direction.

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I'm not quite understand how to solve it? Thank you~

sam ( 2012-10-14 00:50:10 -0600 )edit

You solve it by correcting the spelling error. It is also possible that you forgot a semicolon ';' or a brace '}' somewhere before. Without the source code, I can't be more specific.

roehling ( 2012-10-15 21:55:16 -0600 )edit

Thank you~ Here is the source code. I'm still find somewhere to fix: svn co https://code.ros.org/svn/wg-ros-pkg/branches/trunk_diamondback/stacks/object_recognition/bigg_detector

sam ( 2012-10-26 23:24:53 -0600 )edit

This package should work before, because it is released already. I'm not understand why workable package will also meet header missing problem. How to explain that?

sam ( 2012-10-30 17:22:33 -0600 )edit

Maybe it was written for a different ROS version with a different OpenCV version? There have been some significant changes around version 2.3

roehling ( 2012-10-30 23:13:25 -0600 )edit

That connects a big problem. How you think such a great library doesn't support backward compatibility? Also ROS distribution also seems not support compatibility too. ex.eigen dependency problem.

sam ( 2012-10-31 02:11:48 -0600 )edit

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How to solve 'cannot convert ‘int’ to ‘cv::DescriptorExtractor’ in initialization'?

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